DDD Conference

Mr. Kidanemaryam Reta

Effect of Salinity and Water Regime, Mediated by Rootstock, on CV Syrah Must Metabolite Profile and Vine Physiology

Ben Gurion University of the Negev, Israel

Session 2

Climate change has a variety of detrimental effects on the wine industry. The use of reclaimed water for viticulture is becoming more common due to the diminishing availability of fresh water for irrigation and increasingly polluted underground water. It has taken years to develop tolerant varieties. So,It is crucial to understand how grapevine metabolism responds to altered water and salinity conditions. For this study, we used Syrah varieties grafted on rootstocks 1103Paulsen and SO4 under varying salinity and irrigation levels in an experimental vineyard. A graft of SO4 generally produced higher yield and single berry weight than a graft of 1103Paulsen. It was found that grafts of SO4 accumulated more Cl- ions than grafts of 1103Paulsen, although it was not statistically significant, suggesting that the two rootstocks may show different salt exclusion abilities. Separately harvested Syrah berries were used for the wine must. Salt, water, and rootstock interaction affected the accumulation of several major sugars and amino acids metabolites. Under salinity stress, proline and alanine content increased while lysine, valine, and leucine content decreased. Grafts of 1103Paulsen showed increased levels of amino acids (pyroglutamate, leucine, valine, ethanolamine), sugars (lyxose, xylose, and trehalose), and some other metabolites (cinammate, lactate, and galactarate) than SO4 graft. Generally, the results showed that the two rootstocks possess different mediating effects on the metabolism and physiology of Syrah in response to salinity and water regime. Differences in agronomic, physiological, and metabolite traits, as well as stress tolerance between SO4 and 1103Paulsen may suggest for tolerance differences.

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